With the addition of Kaori into their party, Hajime and his friends make for Myu’s hometown, the coastal city of Erisen. While crossing the Gruen Desert, they save a young Ankajian man, Bize, from a sandworm attack. Apparently, he was searching for a cure to the mysterious disease that has struck his people.

Arata has vanished, and it’s up to Trinity Seven to save him! Akasha Academy is the prime suspect–what is Anastasia hiding behind her knowing smile? The girls from Biblia and Liber Academies must form an unlikely alliance to ensure Arata’s return.